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Instructional Video14:29
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Flipped Math

Addition Postulate

For Students 9th - 12th Standards
Add a little algebra to the geometry. Class members learn about the Addition Postulate for segments and angles. The pupils use their knowledge of solving equations to find lengths of segments and measures of angles. Individuals apply...
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eBook
Open Oregon Educational Resources

Forest Measurements: An Applied Approach

For Students 9th - Higher Ed Standards
Geometry—it's not just for the math classroom! Learners explore the field of forestry through a mathematical lens. An instructional resource explains how forest workers collect data about trees such as height, diameter, and age...
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Unit Plan
Mathematics Vision Project

Circles: A Geometric Perspective

For Teachers 10th - 12th Standards
Circles are the foundation of many geometric concepts and extensions - a point that is thoroughly driven home in this extensive unit. Fundamental properties of circles are investigated (including sector area, angle measure, and...
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Worksheet
Nuffield Foundation

Angles

For Students 7th - 10th
Your learners practice the foundations of measuring two-dimensional angles. As well as the explanation of how to measure angles and their classifications, learners have plenty of practice problems on this instructional activity.
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Worksheet
Math Mammoth

Measuring Angles

For Students 4th - 6th Standards
The first of two pages displays various angles as the measure of degrees of a circular arc. An explanation is written, and learners are asked to model each by holding up two pencils as the rays. The second page provides instruction on...
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Lesson Plan
University of Exeter

Angles and Turns

For Teachers 4th - 7th Standards
Junior geometers investigate the concepts of angles and turns using straws to perform a hands on activity. This is helpful for kinesthetic learners who have a hard time with mathematics. The lesson includes the dialogue to be used during...
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Printables
K-5 Math Teaching Resources

Angles Template

For Students 4th - 6th Standards
Young mathematicians learn to see geometry from different angles with this simple printable resource. Providing multiple visual examples of angles, this simple document can be used as an instructional tool, a skills practice...
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Worksheet
Curated OER

Angles (Various)

For Students 4th - 5th
In this angles worksheet, students analyze a group of 8 angles. There are no directions for use, but students could measure these with a protractor or classify them as acute, right or obtuse.
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Worksheet
Curated OER

Angles – 90’-180’-270’-360’

For Students 7th - 10th
In this angles practice worksheet, students use their problem solving skills to respond to 4 questions that require them to measure angles and turn them.
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Worksheet
Curated OER

Tests for Parallelograms Homework

For Students 9th - 12th
In this test for parallelograms worksheet, students solve 15 short answer problems. Students determine if a given sketch is a parallelogram given angle measures and/or side lengths. Students use knowledge of parallelograms to find...
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Worksheet
Curated OER

Sixth Grade Geometry

For Students 6th
In this geometry worksheet, 6th graders find the measurement of the angles in different shapes given. Students complete 15 problems.
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Worksheet
Curated OER

Measuring Angles

For Students 5th - 6th
In this angles worksheet, students use a protractor and measure a set of angles, correctly checking features and measurements that apply. A reference web site is given for additional activities.
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Worksheet
Curated OER

Angle Comparison to Right Angles

For Students 5th - 6th
In this angles activity, students solve 4 problems in which an angle is analyzed and measured. Students tell if each angle is greater than, less than or equal to a right angle.
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Worksheet
Curated OER

Measure Angles: Greater Less Than or Equal To?

For Students 5th - 6th
In this measuring angles worksheet, students determine whether given angles or more than, less than or equal to 90 degrees. 
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Worksheet
Curated OER

Chapter 8 Worksheet 1: Polygons & Angles

For Students 10th - 12th
For this polygon worksheet, students find the sum of the interior angles of a polygon. They determine the perimeter of equilateral figures, identify concave and convex figures and explore the characteristics of equilateral, equiangular...
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Worksheet
Curated OER

Angle Measures

For Students 5th - 6th
In this angles worksheet, students solve 20 problems pertaining to angle measurement and classification. This page is intended to be an online activity, but can be completed on paper.
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Lesson Plan
Curated OER

The Trig To Soccer

For Teachers 9th - 12th
Learners are given the background information to open the lesson: Suppose a penalty kicker in soccer could choose where he could kick from, as long as he stayed on the back line of the penalty area. Would he have a better chance of...
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Worksheet
Curated OER

Measuring Angles

For Students 5th - 6th
In this angles worksheet, students use a protractor and measure a set of 5 angles, checking the correct measurements and labeling as acute, right, obtuse or straight.
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Worksheet
Curated OER

Angles-Greater Than, Less Than or Equal To 90 Degrees?

For Students 5th - 6th
In this angles learning exercise, students determine whether given angles are greater than, less than or equal to 90 degrees, checking the appropriate answer. A reference web site is given for additional activities.
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Lesson Plan
Curated OER

Basic Geometry Ideas and Angle Measurement

For Teachers 7th
Seventh graders explore the concept of basic geometry. In this basic geometry lesson, 7th graders identify the correct picture for a given vocabulary word such as midpoint, line, ray, or parallel lines. Students discuss examples of...
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Lesson Plan
Curated OER

Angle Attributes and Measures

For Teachers 7th
Seventh graders explore the concept of angles. In this angles instructional activity, 7th graders use protractors to measure angles. Students sing an angle song. Students discuss attributes of angles using a two-color plate manipulative.
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Activity
BBC

Bbc: Angles

For Students 6th - 9th Standards
You can pick up some valuable pointers on angles and lines here. When you finish working your way through the pages you can take an on-line "Test Bite," and check your understanding.
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Activity
AAA Math

Aaa Math: Finding the Fourth Angle of a Quadrilateral

For Students 9th - 10th Standards
An interactive site that instructs and demonstrates how to find the fourth angle of a quadrilateral. This site also has many links to other interactive lessons.
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Activity
AAA Math

Aaa Math: Finding the Third Angle of a Triangle

For Students 9th - 10th Standards
Finding the third angle of a triangle becomes easier by the explanation and examples presented.